Genetic studies on yolk and plasma cholesterol concentration in a local laying hens strain 2- Correlated response of reproductive traits
Abstract: The present experiment was conducted throughout five successive generations to decrease the egg yolk cholesterol concentration in local strain, selected for egg production traits.
Cholesterol and total lipids concentration for egg yolk and plasma were determined and reproductive traits were taken to calculate the correlated response for low level of egg yolk cholesterol content. Fertility and hatchability percentage, age and body weight at sexual maturity, egg number, egg weight and egg mass during the first 90 days of laying estimated the h2s for these traits. The main results obtained could be summarized as follows:
Selection for low level of egg yolk cholesterol content decreased both hatchability percentage and body weight at sexual maturity by 1.96% and 0.07 g, respectively, after four generations of selection, but, increased age at sexual maturity, egg number, egg weight and egg mass by 6.7 day, 4.27 egg, 1.59g and 260.62g, respectively. The heritability for age and body weight at sexual maturity, egg number, egg weight and egg mass during the first 90 days of laying were 0.19, 0.32, 0.05, 0.12 and 0.11, respectively, for selected line, while, the corresponding estimates for control line were 0.51,0.34,0.47,0.13 and 0.18, respectively.
Publication year 2004
Pages 845-856
Availability location معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
Availability number
Organization Name
serial title Egyptian Journal of Agricultural Research
Author(s) from ARC
External authors (outside ARC)
    محمد عبد المنعم كسبة جامعة الاسكندرية
    محمد بهى الدين جامعة الاسكندرية
Agris Categories Animal husbandry
AGROVOC
TERMS		 Egg hatchability. Egg production. Fertility. Layer chickens. Reproductive performance. Selection. Sexual maturity.
Proposed Agrovoc yolk cholesterol;plasma cholesterol;egg yolk cholesterol;total lipids;egg number;egg weight;egg mass;
Publication Type Journal
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